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Yogita Ingle 6 years, 8 months ago
CaC2 is a chemical compound with chemical name Calcium Carbide. It is also called calcium acetylide or phenylglyceryl ether diacetate or glycerol phenyl ether diacetate. Calcium Carbide in its pure form appears as a colorless crystalline solid and is a rock-like structure at room temperature.
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Yogita Ingle 6 years, 9 months ago
- Exchange of gases takes place between the alveoli of lungs and the surrounding blood capillaries. The two main gases exchanged are oxygen and carbon-dioxide. Oxygen is absorbed by the blood capillaries from the lungs alveoli by diffusion while carbon-dioxide is absorbed by the lungs alveoli from blood capillaries by diffusion.
- Transport of oxygen and carbon-dioxide occurs with the help of respiratory pigment called hemoglobin.
- Hemoglobin, the iron containing respiratory pigment is a red colored pigment of blood, which has a very high affinity for oxygen. Hemoglobin though is purple colored but oxy-hemoglobin is of bright red color. Oxygen is transported from lungs to the body cells in the form of oxy-hemoglobin.
- Carbon-dioxide is transported from the body cell to the lungs in the forms of carboxy-hemoglobin, carbonic acid, bicarbonates of sodium and potassium.
Posted by Ajeet Singh 6 years, 9 months ago
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Palak Tyagi 6 years, 4 months ago
Yogita Ingle 6 years, 9 months ago
- Forests are large regions of land covered with tree, shrubs, herbs. It sustains a variety of life forms.
- Naturally occurring plants and animals are the flora and fauna of the forests.
- Forests are biodiversity hotspots.
- The loss of forests and wild life leads to the ecological imbalance.
- Hence, it is important to conserve forests and wild life.
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Gaurav Seth 6 years, 9 months ago
ओम का नियम
परिभाषा : नियत ताप पर ओम के नियम के अनुसार, एक चालक से गुजरने वाली धारा चालक पर विभवांतर के सीधे समानुपाती होती है।
इस तरह से, यदि एक चालक से प्रवाहित धारा I है और V तार पर विभवांतर (या वोल्टता) है, तब ओम के नियम के अनुसार,
I ∝ V (जब T नियत हो)
या, I = V/R ...(i)
जहाँ R एक नियतांक है, जिसे चालक का प्रतिरोध कहा जाता है।
समीकरण (i) को लिखा जा सकता है -
V = I x R ...(ii)
प्रतिरोध की इकार्इ :
प्रतिरोध (R) की SI इकार्इ ओम है। ओम को ग्रीक अक्षर ओमेगा (Ω) से प्रदर्शित किया जाता है।
ओम के नियम से, R = V/I
अब, यदि, V = 1 वोल्ट और I = 1 एम्पियर
तब, 
इस प्रकार, 1 ओम चालक का वह प्रतिरोध है जो इसमें से 1 एम्पियर धारा को प्रवाहित होने देता है जब इसके सिरो पर 1 वोल्ट विभवान्तर लगाए रखा जाता है।
ओम के नियम के परिणाम
एक चालक से प्रवाहित धारा चालक के सिरों पर लगाए गये विभवान्तर के सीधे समानुपाती होती है।
जब एक परिपथ में विभवान्तर नियत रखा जाता है, तो धारा चालक के प्रतिरोध के व्युत्क्रमानुपाती होती है।
I ∝ 1/R
विभवान्तर एवं धारा के मध्य अनुपात नियत रहता है। नियतांक का मान चालक (या प्रतिरोध) के प्रतिरोध पर निर्भर करता है।
V/I = R
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- Monocots show fibrous root system whereas dicots show tap root system.
- Monocot leaves have parallel venation whereas dicot leaves have reticulate venation.
- Monocots have a single cotyledon in their seeds whereas dicots show 2 cotyledons in their seeds.
- The flowers of monocots are trimerous which means they have three or multiple of three petals. The flowers of dicots are pentamerous which means they possess five or multiple of five petals.
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Mr. Paras 6 years, 6 months ago
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